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Rights: The University of Waikato Published 21 July 2007 Size: 110 KB

A doctor holding an externally applied defibrillator in the operating room. These are used to 'kick start' the nerves that control the muscles that make the heart pump blood.

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    Ventricular fibrillation

    A normal heart has a regular beat, and to pump blood, it is coordinated so that the upper chambers of the heart contract before the bottom chambers of the heart contract. When these contractions ...

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